What Is A Valve Train?

What is the valve train? The gas distribution mechanism is the control mechanism of the intake and exhaust pipes. It opens and closes the intake and exhaust valves on time according to the working order and requirements of the working process of the cylinder supply combustible mixed gas or fresh air to the cylinder and discharges the exhaust gas in time. In addition, when the intake and exhaust valves are closed, the cylinder is guaranteed to be sealed.

Generally, the engine of a car uses a valve-type valve train, and the valve train parts mainly include a valve group and a valve train. The valve train in engine used for a reciprocating engine depends on the engine design and whether it is a four-stroke or two-stroke engine.

The valve transmission group mainly includes the camshaft, timing gear, tappet, conduit, push rod, rocker's arm, rocker shaft, etc. Its function is to make the intake and exhaust valves open and close according to the timing specified by the gas distribution phase and Make sure there is enough opening.

How to Clean Valve Train?

As the engine is working, it will inevitably accumulate carbon deposits in the throttle valve, also known as the throttle valve, and the intake pipe. The increase in carbon deposits will force the cylinder to decrease in sealing performance and affect the quality of the mixture. The original good power and economy.

Usually, for the air intake pipe from the air filter element to the throttle valve, some models, including the intake hose, intake manifold, and intake manifold, are generally removed for cleaning. The air intake after the throttle valve is difficult to disassemble separately, so, in the absence of special requirements, it will be cleaned without disassembly. The principle is to use the air pressure to spray the cleaning agent stored in the tank into the parts to be cleaned through the infusion tube and use the engine to work to make the cleaning agent clean at these positions.

For the cleaning of different parts or positions, different hanging bottles need to be selected. In addition, the atomizing nozzles and pressures selected for different models are different.

How to Fix Valve Train Noise?

How to fix valve train noise? When the engine rotates at a low speed, the inertia force of the valve mechanism is not high, so it can be regarded as a multi-rigid body system, and the noise mainly comes from friction and collision between the rigid bodies.

There are several ways to reduce noise:

Reduce the valve clearance. Reducing the clearance can reduce the impact caused by the existence of the clearance, thereby reducing the noise
Improve cam processing accuracy and reduce surface roughness value
Improve the stiffness of the valve mechanism Improve the stiffness of each component of the transmission chain of the valve mechanism and its supporting seat, which can increase its natural frequency, reduce vibration, reduce the distortion of valve movement, and achieve the purpose of noise reduction.
Reduce the weight of the driving components. At the same engine speed, reducing the weight of the driving components reduces its inertial force and reduces the vibration and noise excited by the valve train.
When selecting a cam profile with excellent performance design the cam profile, in addition to ensuring the maximum lift of the valve, the law of valve movement and the best timing of the valve, it is also necessary to make the movement speed of the tappet within the buffer range of the cam profile as small as possible. , so as to reduce the speed of the valve when it starts to rise or seat, and reduce the noise caused by the impact.